josh decided to mix some vinegar with baking soda. he knew that a reaction occurred because he made careful…

josh decided to mix some vinegar with baking soda. he knew that a reaction occurred because he made careful observations. he noted that the mixture started to foam up and bubble and was white in color. how did josh know that a chemical reaction occurred? he was sure a reaction occurred because of\na the formation of a gas.\nb the color of the mixture.\nc the smell of the vinegar.\nd the volume of the mixture.

josh decided to mix some vinegar with baking soda. he knew that a reaction occurred because he made careful observations. he noted that the mixture started to foam up and bubble and was white in color. how did josh know that a chemical reaction occurred? he was sure a reaction occurred because of\na the formation of a gas.\nb the color of the mixture.\nc the smell of the vinegar.\nd the volume of the mixture.

Answer

Brief Explanations:

One of the signs of a chemical reaction is the formation of a gas. Foaming and bubbling indicate gas production. Color, smell, and volume alone are not definitive signs of a chemical reaction.

Answer:

A. the formation of a gas.